- METHOD FOR THE MANUFACTURE OF ALKOXYSILYL-CONTAINING THIOCARBOXYLIC ACID ESTERS
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There is provided herein a method for the manufacture of alkoxysilyl-containing thiocarboxylic acid ester which comprises reacting a thioester with a mercapto-functional alkoxy silane and/or an alkali metal salt, an alkaline earth metal salt, a trisubstituted ammonium salt of an alkoxysilyl-functional thiolate which uses economical and readily available reagents, avoids the use of phosgene or thionyl chloride reagents and produces byproducts that may be recycled.
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Page/Page column 32
(2020/11/12)
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- Preparation thiocarboxylic acid ester of the silane coupling agent method
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The invention discloses a method for preparing a thiocarboxylate silane coupling agent. The method comprises the following steps: (1) dissolving sodium hydrosulfide into water to obtain a water solution of sodium hydrosulfide, adding a phase transfer catalyst (A) into the water solution of sodium hydrosulfide, controlling the temperature at 45 to 80 DEG C, dropwise adding acyl halide into the water solution of sodium hydrosulfide, maintaining the temperature after addition of acyl halide, keeping on performing reactions for 10 to 15 minutes to obtain a water solution of sodium thiocarboxylate, wherein the phase transfer catalyst (A) is composed of tetrabutyl ammonium bromide and tetrabutyl phosphine bromide according to a weight ratio of 0.4-1.3:1; (2) controlling the temperature of the sodium thiocarboxylate water solution obtained in the step (1) in a range of 45 to 70 DEG C, adding a phase transfer catalyst (B), dropwise adding chloropropyl triethoxysilane, maintaining the temperature after addition of chloropropyl triethoxysilane, keeping on carrying out reactions for 3 to 5 hours so as to obtain the thiocarboxylate silane coupling agent, wherein the phase transfer catalyst (B) is composed of tetrabutyl ammonium bromide and tetrabutyl phosphine bromide according to a weight ratio of 2.5-3.5:1.
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Paragraph 0031; 0034; 0037; 0040; 0043; 0044; 0045-0072
(2017/12/27)
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- Method for preparing mercaptosilane coupling agent by using channel reactor
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The invention provides a method for preparing a mercaptosilane coupling agent by using a channel reactor. In a solvent, a channel reactor is utilized to prepare the mercaptosilane coupling agent. The structural general formula of the mercaptosilane coupling agent is XmSiC3H6S(C=O)nY, wherein each X is independently alkyl group, alkoxy group, hydroxy group, R(OR')LO-, -ORO- or N(RO-)3, and at least one X is alkoxy group, hydroxy group or N(RO-)3; Y is hydrogen or alkyl group; R and R' are respectively independently straight-chain or branched-chain alkyl group; the average value of L is 1-30; m is 1, 2 or 3; and n is 0 or 1. The corrected diameter of the channel reactor channel is one micrometer to several centimeters; and the channel reactor is connected with an after-treatment device. The method solves the problems of long reaction period, poor stability, existence of impurity polymers and the like in the large-size reactor, and especially reduces the odor caused by the large-size reactor production.
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Paragraph 0064; 0065; 0066
(2016/11/17)
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- CONTINUOUS PROCESS FOR THE PREPARATION OF THIOCARBOXYLATE SILANE
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The invention is directed to a process for the preparation of thiocarboxylate silane comprising reacting an aqueous solution of a salt of a thiocarboxylic acid with a haloalkylalkoxysilane in the presence of a solid supported catalyst. The invention is also directed to a process for the preparation of an aqueous solution of a salt of a thiocarboxylic acid which comprises reacting an aqueous solution of a sulfide and/or hydrosulfide with a carboxylic acid halide and/or acid anhydride.
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Page/Page column 30; 32; 42
(2015/02/02)
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- METHOD FOR PRODUCING THIOESTER GROUP-CONTAINING ORGANOSILICON COMPOUND, THIOESTER GROUP-CONTAINING ORGANOSILICON COMPOUND, COMPOUNDING AGENT FOR RUBBER, RUBBER COMPOSITION, AND TIRE
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A new method for producing a thioester group-containing organosilicon compound by a convenient reaction with dramatically improved workability generating reduced byproduct is provided. The method comprises reacting an organosilicon compound having a hydrolyzable silyl group and mercapto group with a carboxylic anhydride. Also provided are an organosilicon compound having a hydrolyzable silyl group, a thioester group, and carboxyl group in the same molecule capable of remarkably reducing hysteresis loss of the cured rubber composition; a compounding agent for rubber containing such organosilicon compound; a rubber composition prepared by blending such compounding agent for rubber; and a tire produced by using the cured rubber composition are also provided.
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Page/Page column 8
(2012/12/13)
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- Blocked mercaptosilane coupling agents, process for making and uses in rubber
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The invention relates to sulfur silane coupling agents containing multiple blocked mercapto groups which are in a state of reduced activity until activated. The coupling agents are advantageously used in rubber formulations, for example, for fabricating tires with low rolling resistance.
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Page/Page column 11
(2008/12/06)
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- Aqueous catalytic process for the preparation of thiocarboxylate silane
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An aqueous process is described in which thiocarboxylate silane is produced from haloalkyl silane by reaction of the haloalkyl silane with an aqueous solution of thiocarboxylate salt in the presence of a catalytically effective amount of alkylguanidinium salt.
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Page/Page column 7
(2008/06/13)
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- PROCESS FOR THE PREPARATION OF THIOCARBOXYLATE SILANE
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An aqueous process is described in which thiocarboxylate silane is produced from haloalkyl silane by reaction of the haloalkyl silane with an aqueous solution of thiocarboxylate salt. Also described is a process for the preparation of aqueous thiocarboxylate salt from a sulfide and/or hydrosulfide and an acid chloride and/or acid anhydride.
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Page/Page column 23-24
(2008/06/13)
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- Process for the manufacture of blocked mercaptosilanes
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A process for the manufacture of a blocked mercaptosilane comprising: reacting at least one polysulfane-containing organosilicon compound of the general formula: (R13SiG)2Sn (a) in which each R1is independently methoxy, ethoxy or alkyl of from 1 to about 6 carbon atoms, provided, that at least one R1group is methoxy or ethoxy, G is an alkylene group of from 1 to about 12 carbon atoms and n is from 2 to about 8, with at least one alkali metal, alkaline earth metal or a basic derivative of an alkali metal or alkaline earth metal to provide the corresponding metal salt of the polysulfane-containing organosilicon compound and; (b) reacting the metal salt of the polysulfane-containing organosilicon compound with an acyl halide or carbonyl dihalide to provide a blocked mercaptosilane.
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Page column 7-9
(2010/02/08)
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